Middlsngs-purifier



(No Model.)

- A. HUNTER.

MIDDLINGS PURIFIEB.

EEEFIHTIIHEEE N. PETERS. PlmloLithngnplwr, Washington, v.0.

UNlTFD drains PATENT @rricn.

ANDREW HUNTER, OF MILYVAUKEE, WISCONSIN.

IViIDDLlNGS=PURIFlER EI PECIFICATION forming part of Letters Patent No. 358,669, dated March 1, 1857.

Application filed July 18, 1885. Serial No. 171.981. (No model.) Patented in CanndnMayY, 1885, No.21,011.

To aZZ whom it may concern.-

Be it known that I, ANDREW HUNTER, of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in MiddlingsPuii fiers; and I do declare the following to bea full, clear, and exact description of the same.

My present invention relates to middlingspurifiers, being designed as an improvement on the one patented to me April 15, 1884, No. 296,752; and it consists in certain peculiarities of construction whereby the purification of middlings is more thoroughly accomplished, as will be hereinafter described with reference to the accompanying drawings, in which-- Figure l is an elevation of the tail end of my machine, and Fig. 2 a similar View of the head end. Fig. 3is alongitudinal vertical section on line 00 00, Fig. 2; Fig. 4, a horizontal section of a portion of the tail end of the machine, taken on a line with the top of the screen-fran1e; Fig. 5, a side elevation of the screen-frame; Fig. 6, a transverse section of Fig. 5.

Referring by letter to the drawings, A rep resents the main frame supporting the opera tive elements of my device. The feed-box B is secured to the head end of the screen-frame G, and this latter part is'horizont-ally suspended in the frame A by means of flat links D, said feed-box being arranged to deliver the middlings evenly upon the screen. The links D have their ends a bolted or otherwise rigidly secured at one end to the frame A, and their other ends are formed with eyes a, that closely fit transverse rods 1), extending from side to side of the screen-frame. The ends a of the links that fit the transverse rods 2) come snugly against the inner sides of the screen-frame O, and the other ends, a, are oppositely secured to the main frame. In other words, the ends a of the links at the tail end of the ,machine are secured to the upper portion of the frame A, while those at the head end are secured to the lower portion of said frame. By the peculiar arrangement of the links D the screen-frame O is both suspended and supported, while at the same time said frame and the middlings on the screen are prevented from moving laterally.

The silk E, that forms the screen, is attache to the ends of the frame 0 by clamp c, and to the sides thereof by adjustable longitudinal strips (Z and similar fixed strips, cl, said silk being tacked or otherwise suitably secured to theformerstrip. Passedthroughperforations in the strips (2 d are bolts 6, and the screwthreaded ends of said bolts, that come beneath the strips (2, are provided with thumbnuts 6, these latter being operated to secure the proper adjustment of the strips (2. Tacked or otherwise suitably secured to the upper side of the silk, above the adjustable strips (1, are longitudinal stripsf, that serve to guide the middlings and prevent them from running over the sides of the screen. The strips f are fastened only to the silk, and move with it when it is adjusted.

The transverse braces C, that support the silk in the screen-frame G, are each provided with aseries of openings, 9, sufficiently large to permit the passage of air from head to tail of the machine with but little obstruction, and by this construction the formation of eddies adjoining said transverse braces is prevented.

Traveling over the top of the sceeen are brush-sections F, that are fastened to endless chains G,operating on sprocketwheels It, said brushes being constructed and arranged to operate similar to those described in my former patent above referred to.

The purified niiddlings that pass through the screen into the hopper H are carried off by a conveyer,l, suitably located in the bottom of said hopper.

The main driving'shaft K is mounted in suitable bearings, t, secured to the frame Aat the tail end of the machine, and has keyed thereto an eccentric, L, which is designed to operate upon a transverse bar, M, secured to the under side of the adjacent screen-frame.

Passed through the posts of the tail end of the machine, so that their heads will rest against the inner sides of said posts, are rods or bolts m, which carry springs 02, preferably composed of rubber.

The outer or screw-threaded ends of the parts at receive a transverse butting-bar, N, which is held in place thereon against the springs or by nuts 0, and by operating these nuts a horizontal adjustment of said bar is readily effected. The eccentric L, being revolved by the rotation of the drivingshal't K, comes in contact with the transverse bar M,

to force back the screen-frame C, which has its opposite end impinging against a springarm, 0, secured to the head end of the frame A, the tension of this spring-arm being regulated by a set-screw, p.

The spring-arm 0 serves to normally retain the screen-frame in position to be acted upon by the eccentric L, and as the latter passes out of contact with the transverse bar M the recoil of this spring acts to throw said screenframe back against the butting-bar N. The screen-frame as it strikes the butting-bar stops suddenly, the blow producing a percussive movement, which serves to accelerate the travel of the middlings on thescreen and precipitate the heavier substances to the bottom, leaving the lighter on top, to be removed by air-currents, which are produced by the suction of a fan, P, the latter being located on the top of the machine at its tail end. The movement of the niiddlings on the screen is continuous, and therefore unaffected by the stopping of the screen-frame.

When the butting-bar N is moved out, the screen-frame has a greater play toward the tail of the machine, and by a reverse adjustment this play is lessened, thereby enabling me to regulate the vibratory action of said screen frame at will.

At the head end of the machineIinsert tubes It, that come under the screen-frame G and extend inward about half the length of the machine, the object of this construction being to supply a sufficient quantity of air to the tail end of the said machine, where the middlings are coarse and the impurities heavy. By the construction just described I confine the air-supply at the most desirable point to secure the best results, thereby preventing the fine middlings from being carried off and wasted in the dust-room, as would be the case were the necessary quantity of air required for the tail end of the machineintroduced directly at the head end thereof.

The tubes R are imperforate and open only at each end, and are provided with valves or dampers 7' near their outer ends, by which the air-supply is regulated.

, Above the tubes R is an aperture, S, for the admission of air to the head end of the machine, and the quantity is governed bya valve or damper, 8, located in said aperture.

At the tail end of the machine I insert a series of air-tubes, T, that extend through the passage U, designed for the escape of the tailings that pass over the end of the screen. The air that enters through the tubes T spreads in a thin sheet as it approaches the silk E, and thus acts on each particle of the middli ngs and carries off the heavy impurities without disturbing the fine middlings at the head. As the fan P produces a vacuum, the latter is immediately supplied through the parts R, S,

and T, thereby causing a graduated and continuous current of air to pass up through the silk E.

The conveyor I is provided with a pinion that meshes with a gear-wheel-on a shaft, V, supported in suitable bearings and carrying a pulley that is driven by a belt running over another pulley on the main shaft K. A belt and pulleys transmit motion from the main shaft to the fan-shaft W, and the shaft V carries a sprocket-wheel, that operates an endless chain, X, operatively connected to a similar wheel upon one of the shafts carrying the parts 7z,that drive the chains G, having secured thereto the brush-sections F.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a middlings-purifier, the combination of a main casing provided with inlet-openings at its ends, and an exhaust-fan, with a vibratory screen-frame consistingof suitable side pieces, a series of transverse braces, each pierced with air-openings, and a bolting-cloth stretched over said sides and braces, and

means, substantially as described, for operating said fan and screen-frame, as set forth.

2. In a middlings-purifier, the combination of a main casing having inlet-openings at its ends, and anexhaust-fan, with a vibratory screen-frame having its side pieces provided with fixed longitudinal strips, a bolting-cloth stretched over said frame, and likewise provided with longitudinal strips, and means, substantially as described, for adjustably uniting the respective strips and for operating said fan and screen-frame, as set forth.

3. In a middlings-purifier, the combination of a main casing having inlet-openings at its ends, and an exhaust-fan, with a vibratory screen-frame having its sides provided with fixed longitudinal strips, a bolting-cloth having its sides likewise provided with longitudinal strips adj ustably connected with those of said frame and having its ends clamped'to the latter, and means, substantially as described, for operating said fan and screen frame, as set forth.

4:. In a middlingspurifier, a main casing, imperforate open-ended tubes extending inwardly from the feed end of said casing, and valves located near the outer ends of said tubes, in combination with a vibratory bolting-screen, an exhaust-fan, and means, substantially as described, for operatingtheselatter parts, as set forth.

5. In a middlings-purifier, a main casing having atransverse aperture in its feed end, imperforate open-ended tubes extending inwardly from the feed end below said aperture, and valves arranged to close said tubes and aperture, in combination with a vibratory bolting-screen, an exhaust-fan, and means, substantially as described, for operating these latter parts, as set forth.

6. In a middlingspurifier, a main casing having a transverse aperture in its feed end, air-tubes extending inwardly from the feed end, valves for closing said tubes and apertures, and a series of short air-tubes at the tail end of said casing, in combination with a viwith the main casing having inlet-openings at its ends and an exhaust-fan, of a loosely-hung bolting-screen, a main shaft provided with an eccentric bearing against the tail of the screen, a spring-arm impinging against the head thereof, a transverse buttingbar, against which the tail of the screen strikes, and means, substantially as described, for connecting the main shaft with the exhaust-fan, as set forth.

ANDREW HUNTER.

\Vitnesses:

W. E. SLossoN, K. F. SLossoN. 

